Question

please solve this question​

Answer 1

Answer:

9a²-42ab-7ca-14bc+7b²+c²

Step-by-step explanation:

(3a-7b-c)(3a-7b-c)

3a(3a-7b-c)-7b(3a-7b-c)-c(3a-7b-c)

9a²-21ab-3ca-21ab+7b²+7bc-4ca+7bc+c²

9a²-42ab-7ca-14bc+7b²+c²

I hope this will help you